I was cleaning my bike and when I take my rear wheel off I notice the quick release skewer is bent. I bent it back and when I lock my rear wheel back I notice the spin part of the skewer's plastic fell off.
When I remove it I notice that the derailleur hanger has a dent on it. I don't know what made that dent but I think I might have tighten the wheel too hard.
Right now I also want to buy a new hanger but I can't find it anywhere in the Internet, can someone please tell me what made my derailleur hanger to have a dent and what is the hanger's name.
Here is the picture of the hanger and thank you